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            <ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#学习笔记-Java设计模式之Mediator-Pattern"><span class="post-toc-number">1.</span> <span class="post-toc-text">学习笔记 : Java设计模式之Mediator Pattern</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#定义"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">定义</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#角色分析"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">角色分析</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#程序示例"><span class="post-toc-number">1.3.</span> <span class="post-toc-text">程序示例</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#类图"><span class="post-toc-number">1.3.1.</span> <span class="post-toc-text">类图</span></a></li></ol></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#程序示例-扩展"><span class="post-toc-number">1.4.</span> <span class="post-toc-text">程序示例-扩展</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#类图-1"><span class="post-toc-number">1.4.1.</span> <span class="post-toc-text">类图</span></a></li></ol></li></ol></li></ol>
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<article id="post-Java设计模式之Mediator-Pattern"
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        <h1 class="post-card-title">Java设计模式之Mediator Pattern</h1>
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            <time class="post-time" title="2019-10-10 12:24:52" datetime="2019-10-10T12:24:52.000Z"  itemprop="datePublished">2019-10-10</time>

            


            

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            <h2 id="学习笔记-Java设计模式之Mediator-Pattern"><a href="#学习笔记-Java设计模式之Mediator-Pattern" class="headerlink" title="学习笔记 : Java设计模式之Mediator Pattern"></a>学习笔记 : Java设计模式之Mediator Pattern</h2><h3 id="定义"><a href="#定义" class="headerlink" title="定义"></a>定义</h3><p><em>中介者设计模式 : 定义一个对象来封装一系列对象的交互. 中介者模式使各个用户对象之间不需要显示地相互引用,从而使其耦合松散,而且用户可以独立地改变它们之间的交互. (  Mediator Pattern : Define an object that encapsulates how a set of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicitly,and it lets you vary their interaction independently. )</em></p>
<blockquote>
<p>中介者模式又称为调停者模式,它是一种对象行为模式. 在中介者设计模式中,通过引入中介者来简化对象之间的复杂交互,中介者模式是迪米特法则的一个典型应用</p>
</blockquote>
<h3 id="角色分析"><a href="#角色分析" class="headerlink" title="角色分析"></a>角色分析</h3><ol>
<li><em><code>Mediator( 抽象中介者 )</code> : 它定义一个接口,该接口用于与各同事对象之间进行通信.</em></li>
<li><em><code>ConcreteMediator( 具体中介者 )</code> : 它是抽象中介者的子类,通过协调各个同事对象来实现协作行为,它维持了对各个同事对象的引用.</em></li>
<li><em><code>Colleague( 抽象同事类 )</code> : 它定义各个同事类公有的方法,并声明了一些抽象方法供子类实现,同时它维持了一个对抽象中介者类的引用,其子类可以通过该引用与中介者通信.</em></li>
<li><em><code>ConcreteColleague( 具体同时类 )</code> : 它是抽象同事类的子类,每一个同事对象在需要和其他同事对象通信时先与中介者通信,通过中介者间接完成与其他同事类的通信; 在具体同事类中实现了在抽象同事类中声明的抽象方法.</em></li>
</ol>
<h3 id="程序示例"><a href="#程序示例" class="headerlink" title="程序示例"></a>程序示例</h3><p><em>下面是一个使用中介者模式的简单示例程序 : 设计一个 CRM 桌面系统,其中包含一个客户信息管理模块,其界面组件之间存在复杂的交互关系,如果删除一个客户,则从客户列表中( List )中删掉对应的项,客户选择组合框( ComboBox )中的客户名称也将减少一个; 如果增加一个客户信息,则客户列表中将增加一个客户,并且组合框中也将增加一项. 为了更好地处理界面组件之间的交互,现使用中介者模式设计该系系统~</em></p>
<ol>
<li><p><em>Mediator.java : 抽象中介者类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 抽象中介者类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-12:49 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="class"><span class="keyword">class</span> <span class="title">Mediator</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">void</span> <span class="title">componentChanged</span><span class="params">(Component component)</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>ConcreteMediator.java : 具体中介者类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 具体中介者类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-12:50 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ConcreteMediator</span> <span class="keyword">extends</span> <span class="title">Mediator</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//维持对各个同事对象的引用</span></span><br><span class="line">    <span class="keyword">public</span> List list;</span><br><span class="line">    <span class="keyword">public</span> Button addButton;</span><br><span class="line">    <span class="keyword">public</span> TextBox userNameTextBox;</span><br><span class="line">    <span class="keyword">public</span> ComboBox comboBox;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//封装同事对象之间的交互</span></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">componentChanged</span><span class="params">(Component component)</span> </span>&#123;</span><br><span class="line">        <span class="comment">//单击按钮</span></span><br><span class="line">        <span class="keyword">if</span> (component == addButton) &#123;</span><br><span class="line">            System.out.println(<span class="string">"--- 点击增加信息按钮 ---"</span>);</span><br><span class="line">            list.update();</span><br><span class="line">            comboBox.update();</span><br><span class="line">            userNameTextBox.update();</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">//从列表框选择客户</span></span><br><span class="line">        <span class="keyword">else</span> <span class="keyword">if</span> (component == list) &#123;</span><br><span class="line">            System.out.println(<span class="string">"\n--- 从列表框选择客户 ---"</span>);</span><br><span class="line">            list.select();</span><br><span class="line">            userNameTextBox.setText();</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">//从组合框选择客户</span></span><br><span class="line">        <span class="keyword">else</span> <span class="keyword">if</span> (component == comboBox) &#123;</span><br><span class="line">            System.out.println(<span class="string">"\n--- 从组合框选择客户 ---"</span>);</span><br><span class="line">            comboBox.select();</span><br><span class="line">            userNameTextBox.setText();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>Component.java : 抽象组件类, 充当抽象同事类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 抽象组件类, 充当抽象同事类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-12:51 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="class"><span class="keyword">class</span> <span class="title">Component</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">protected</span> Mediator mediator;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setMediator</span><span class="params">(Mediator mediator)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.mediator = mediator;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//转发调用</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">changed</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        mediator.componentChanged(<span class="keyword">this</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">void</span> <span class="title">update</span><span class="params">()</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>Button.java : 按钮类, 充当具体同事类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 按钮类, 充当具体同事类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-12:51 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Button</span> <span class="keyword">extends</span> <span class="title">Component</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">update</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="comment">//System.out.println("点击添加信息按钮");</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>List.java : 列表框类, 充当具体同事类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 列表框类, 充当具体同事类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-12:52 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">List</span> <span class="keyword">extends</span> <span class="title">Component</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">update</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"列表框增加一项: 黄宇辉"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">select</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"列表框选中项: 黄浩然"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>ComboBox.java : 组合框类, 充当具体同事类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 组合框类, 充当具体同事类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-12:55 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ComboBox</span> <span class="keyword">extends</span> <span class="title">Component</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">update</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"组合框增加一项: 黄宇辉"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">select</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"组合框选中项: 黄浩然"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>TextBox.java : 文本框, 充当具体同事类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 文本框, 充当具体同事类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-12:56 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TextBox</span> <span class="keyword">extends</span> <span class="title">Component</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">update</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"客户信息增加成功后文本框被清空"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setText</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"文本框显示: 黄浩然"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>Client.java : 客户端测试类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_1;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 客户端测试类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-12:58 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Client</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        <span class="comment">//定义中介者对象</span></span><br><span class="line">        ConcreteMediator mediator = <span class="keyword">new</span> ConcreteMediator();</span><br><span class="line"></span><br><span class="line">        <span class="comment">//定义同事对象</span></span><br><span class="line">        List list = <span class="keyword">new</span> List();</span><br><span class="line">        Button addButton = <span class="keyword">new</span> Button();</span><br><span class="line">        ComboBox comboBox = <span class="keyword">new</span> ComboBox();</span><br><span class="line">        TextBox userNameTextBox = <span class="keyword">new</span> TextBox();</span><br><span class="line"></span><br><span class="line">        <span class="comment">//关联中介者</span></span><br><span class="line">        list.setMediator(mediator);</span><br><span class="line">        comboBox.setMediator(mediator);</span><br><span class="line">        addButton.setMediator(mediator);</span><br><span class="line">        userNameTextBox.setMediator(mediator);</span><br><span class="line"></span><br><span class="line">        <span class="comment">//初始化具体同事类</span></span><br><span class="line">        mediator.list = list;</span><br><span class="line">        mediator.comboBox = comboBox;</span><br><span class="line">        mediator.addButton = addButton;</span><br><span class="line">        mediator.userNameTextBox = userNameTextBox;</span><br><span class="line"></span><br><span class="line">        <span class="comment">//通过中介者进行通信</span></span><br><span class="line">        addButton.changed(); <span class="comment">//点击添加客户信息按钮</span></span><br><span class="line">        list.changed(); <span class="comment">//从列表框中选择客户</span></span><br><span class="line">        comboBox.changed(); <span class="comment">//从组合框中选择客户</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>程序运行结果如下所示 :</em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">--- 点击增加信息按钮 ---</span><br><span class="line">列表框增加一项: 黄宇辉</span><br><span class="line">组合框增加一项: 黄宇辉</span><br><span class="line">客户信息增加成功后文本框被清空</span><br><span class="line"></span><br><span class="line">--- 从列表框选择客户 ---</span><br><span class="line">列表框选中项: 黄浩然</span><br><span class="line">文本框显示: 黄浩然</span><br><span class="line"></span><br><span class="line">--- 从组合框选择客户 ---</span><br><span class="line">组合框选中项: 黄浩然</span><br><span class="line">文本框显示: 黄浩然</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h4 id="类图"><a href="#类图" class="headerlink" title="类图"></a>类图</h4><figure class="image-bubble">
                <div class="img-lightbox">
                    <div class="overlay"></div>
                    <img src="/2019/10/10/Java设计模式之Mediator-Pattern/Mediator-Pattern-ClassDiagram-1.png" alt title>
                </div>
                <div class="image-caption"></div>
            </figure>
<h3 id="程序示例-扩展"><a href="#程序示例-扩展" class="headerlink" title="程序示例-扩展"></a>程序示例-扩展</h3><p><em>对上述示例程序进行改进,使客户信息管理窗口下端能够及时显示当前系统中客户信息的总数. 由于上述案例使用了中介者设计模式,所以在原有系统中增加新的组件( 既新的同事类 )将变得很容易,解决方案 : 首先增加一个 Label 类,其次增加一个 ConcreteMediator 的子类 SubConcreteMediator 来实现对 Label 对象的引用,然后在新增的中介者类 SubConcreteMediator 中通过覆盖 componentChanged() 方法实现所有组件( 包括新增Lable组件 )之间的交互. 既原有组件类无需做任何修改,客户端代码仅需做少量修改,其更加符合开闭原则~</em></p>
<ol>
<li><p><em>Label.java : 文本标签类, 具体同事类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_2;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 文本标签类, 具体同事类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-1:30 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Label</span> <span class="keyword">extends</span> <span class="title">Component</span> </span>&#123;</span><br><span class="line">    </span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">update</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"[ 文本标签内容改变,客户信息总数: +1 ]"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>SubConcreteMediator.java : 在新增的该中介者类, 通过覆写componentChanged()方法来实现所有组件(包括新增Label组件)之间的交互</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_2;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 在新增的该中介者类, 通过覆写componentChanged()方法来实现所有组件(包括新增Label组件)之间的交互</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-1:30 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">SubConcreteMediator</span> <span class="keyword">extends</span> <span class="title">ConcreteMediator</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//增加对Label对象的引用</span></span><br><span class="line">    <span class="keyword">public</span> Label label;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">componentChanged</span><span class="params">(Component component)</span> </span>&#123;</span><br><span class="line">        <span class="comment">//super.componentChanged(component);</span></span><br><span class="line">        <span class="comment">//单击按钮</span></span><br><span class="line">        <span class="keyword">if</span> (component == addButton) &#123;</span><br><span class="line">            System.out.println(<span class="string">"--- 点击增加信息按钮 ---"</span>);</span><br><span class="line">            list.update();</span><br><span class="line">            comboBox.update();</span><br><span class="line">            userNameTextBox.update();</span><br><span class="line">            label.update(); <span class="comment">//更新文本标签</span></span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">//从列表框选择客户</span></span><br><span class="line">        <span class="keyword">else</span> <span class="keyword">if</span> (component == list) &#123;</span><br><span class="line">            System.out.println(<span class="string">"\n--- 从列表框选择客户 ---"</span>);</span><br><span class="line">            list.select();</span><br><span class="line">            userNameTextBox.setText();</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">//从组合框选择客户</span></span><br><span class="line">        <span class="keyword">else</span> <span class="keyword">if</span> (component == comboBox) &#123;</span><br><span class="line">            System.out.println(<span class="string">"\n--- 从组合框选择客户 ---"</span>);</span><br><span class="line">            comboBox.select();</span><br><span class="line">            userNameTextBox.setText();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>Client.java : 客户端测试类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mediator_pattern.mediator_pattern_2;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: design-patterns</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 客户端测试类</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: 黄宇辉</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 10/10/2019-12:58 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Client</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        <span class="comment">//定义中介者对象</span></span><br><span class="line">        SubConcreteMediator mediator = <span class="keyword">new</span> SubConcreteMediator();</span><br><span class="line"></span><br><span class="line">        <span class="comment">//定义同事对象</span></span><br><span class="line">        List list = <span class="keyword">new</span> List();</span><br><span class="line">        Label label = <span class="keyword">new</span> Label();</span><br><span class="line">        Button addButton = <span class="keyword">new</span> Button();</span><br><span class="line">        ComboBox comboBox = <span class="keyword">new</span> ComboBox();</span><br><span class="line">        TextBox userNameTextBox = <span class="keyword">new</span> TextBox();</span><br><span class="line"></span><br><span class="line">        <span class="comment">//关联中介者</span></span><br><span class="line">        list.setMediator(mediator);</span><br><span class="line">        label.setMediator(mediator);</span><br><span class="line">        comboBox.setMediator(mediator);</span><br><span class="line">        addButton.setMediator(mediator);</span><br><span class="line">        userNameTextBox.setMediator(mediator);</span><br><span class="line"></span><br><span class="line">        <span class="comment">//初始化具体同事类</span></span><br><span class="line">        mediator.list = list;</span><br><span class="line">        mediator.label = label;</span><br><span class="line">        mediator.comboBox = comboBox;</span><br><span class="line">        mediator.addButton = addButton;</span><br><span class="line">        mediator.userNameTextBox = userNameTextBox;</span><br><span class="line"></span><br><span class="line">        <span class="comment">//通过中介者进行通信</span></span><br><span class="line">        addButton.changed(); <span class="comment">//点击添加客户按钮</span></span><br><span class="line">        list.changed(); <span class="comment">//从列表框中选择客户</span></span><br><span class="line">        comboBox.changed(); <span class="comment">//从组合框中选择客户</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>程序运行结果如下所示 :</em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">--- 点击增加信息按钮 ---</span><br><span class="line">列表框增加一项: 黄宇辉</span><br><span class="line">组合框增加一项: 黄宇辉</span><br><span class="line">客户信息增加成功后文本被清空</span><br><span class="line">[ 文本标签内容改变,客户信息总数: +1 ]</span><br><span class="line"></span><br><span class="line">--- 从列表框选择客户 ---</span><br><span class="line">列表框选中项: 赵艳春</span><br><span class="line">文本框显示: 赵艳春</span><br><span class="line"></span><br><span class="line">--- 从组合框选择客户 ---</span><br><span class="line">组合框选中项: 赵艳春</span><br><span class="line">文本框显示: 赵艳春</span><br></pre></td></tr></table></figure>
</li>
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